Fan or blower for ventilating purposes.



N0. 650,582 Patented 001. 30, I900.

I A. W. METCALFE. FAN 0R BLOWER FOR VENTILATING PURPOSES.

(Application 81cc! June 14, 1897.)

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(ModaL) ,4 TTUR N E Yf No. 660,582. Patented Oct. 30, I900.

A.- w. METCALFE.

FAN 0B BLOWER FOR VENTILATING PURPOSES.

(Application filed June 14, 1597. (Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT OFFICE.

ARTHUR WILSON METOALFE, OF BELFAST, IRELAND.

FAN OR BLOWER FOR VENTILATING PU RPOSES.

SPECIFICATION forming part Of Letters Patent No. 660,582, dated October 30, 1906.

Application filed June 14, 1897. Serial No. 640,755. (Model) vices, and particularly to propellers or blowers for use in ventilating buildings or compartments therein; and the object thereof is to provide devices of this class of improved construction, the improvement consisting in the shape or form and construction of the propellersor blowers and the separate parts thereof and the method of connecting the blades of the propellers or blowers with the operative or moving parts of the apparatus;

. and with these and other objects in view the invention'consists in the construction, combination, and arrangement of parts hereinafter described and claimed.

The invention is the same as that for which Letters Patent were granted in Great Britain February 28, 1896, No. 4,474, and is fully disclosed in the following specification, of which the accompanying drawings form a part, in which' Figure 1 is a transverse sectional view of my improved propeller -or blower; Fig. 2, a bottom plan view thereof; Fig. 3, a perspective view of a frame in which the propeller or blower is mounted; Fig. 4, a similar view showing said frame with the propeller or blower and its shaft disconnected therefrom; Fig. 5, a view similar to Fig. 1, showing a modified form of construction; and Fig. 6 a plan view looking in the direction of the arrow X. Figs. 2, 3, and 4 are on a reduced scale, Fig. 3 is on a scale smaller than Fig. 2, and Fig. 4 is on a still smaller scale.

In the drawings forming part of this specificationthe separate parts of my improvement are designated by the same letters of reference in each of the views, and in the practice of my invention I provide a propeller or. blower which comprises curved blades (1-, which are attached to a central nave or boss b, which is secured to a driving-shaft o and to a conical rim d, the connection between the conical rim d and the base of the boss I? being made by means of strips 12 any desired number of which may be employed, and the inner ends of said strips 11 are secured to the boss I) and the outer ends thereof to a ring 12 which is secured to or formed integrally with the larger perimeter of the conical rim 61. My improved propeller or blower are convex and curved inwardly from the smaller diameter of the conical rim (1 in the direction of the base of the boss b, and the supplemental conical rim (1 is connected with the larger perimeter of the outer conical rim d by strips a The shapes of the blades a and a are clearly shown in Fig. 1, and the strips 11 and a are secured to the edges thereof, so as to give strength and stability to the propeller or blower. is conical in form, as shown in Fig. 1, and the inner ends of the blades a are connected with the conical portion of said boss. i

The propeller-or blower revolves freely in. a plate 6, which is secured toor forms a part The base ofthe boss I) of a wall in which the propeller or blower is i mounted in the usual manner, orsaid plate 6 may form a part of a frame,(shown in Figs? and 4,) in which the propeller may be mounted, said frame being adapted to'be secured toJor in a wall, as will be readily understood;

The spindle or shaft 0 is provided with a driving-pulley c, as shown in Fig. l, and said driving-pulley iswhat is known as a fdouble pulley, the part 0 being used when the power is transmitted by a belt and the part c when a cord is used for this purpose.

The spindle or shaft 0 may be supported in any suitable manner, and in Fig. 31 have shown the frame consistingof the plate eand yokes f-and f, secured to the opposite sides thereof, in which the said shaft is mounted,

and said plate is provided with a central circular opening,in which the propeller or blower revolves. The object of Fig. 3 is to show simply one method of mounting the propeller or blower, and in Fig. 4the frame, consisting of the plate e and the yokesfand f, is shown side, and said blades are slightly spiral in form, and the object of this construction is to take advantage of the tangential tendency of the revolving air in' the fan or blower in order to produce greater draft in passing through the fan or blower.

In the modification shown'in Figs. 5 and 6 the fan or blower revolves in a stationary rim H, secured to the plate a and of similar form to the rim d of the fan-or blower, and the outer surface of the rim d of the fan or blower is provided with blades h, arranged spirally or at an inclination thereon, and the inner surface of the'stationary rim H is provided with corresponding blades h which are arranged at an inclination opposite to that of the blades h of the rim d of the blower or propeller, and by reason of this construction it will be apparent that the capacity of the propeller or blower is increased.

My invention is not limited to the form in cross-section of the rims d and H, and it will be apparent that changes in and modificationsof the construction described may be made without departing from the spirit of my invention or sacrificing its advantages.

Having fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A fan or blower, comprising a central boss, a plurality of spirally-arranged blades, the inner ends of which are narrower than the outer ends, and secured to said boss, and the outer ends of which are secured to a conical outer rim, said boss and said rim being also connected on the delivery side ofthe propeller or bl'ower by strips towhich said blades are also secured, said propeller or blower being also provided with an inner supplemental conical rim placed centrally between the boss and the outer rim, and with supplemental blades arranged between the first-named blades and secured to the outer rim and extending inwardly to the supplemental rim, substantially as shown and described.

2. Apropeller-orblower,comprisingashaft, a central boss rigidly secured to said shaft which is conical in form at the delivery side of the propeller or blower, spirally-arranged blades, the inner ends of which are narrower than the outer ends and connected with said conical portion of said boss, and the -outer ends of which are connected with. a conical rim, said conical portion of the boss and the outer rim being also connected by strips to which said blades are secured, and an intermediate supplemental rim secured centrally between the boss and the outer rim, and sup plemental blad es arranged between the outer and supple mental rims,su bstantially as shown and described- In testimony that I claim the foregoing as my invention I have signed my name, in presfence of the subscribing witnesses, this 10th 

